Freshness of cement: conditions for syngenite CaK2(SO4)2·H2O formation
Source abstract
Abstract
Laboratory experiments disclose that syngenite CaK2 (SO4)2·H2O forms rapidly from mixtures of gypsum and K2S04 only at high relative humidities, ≥96% at 30°C. The concept of a critical humidity below which reaction essentially ceases is developed. The implications of syngenite formation for the freshness of stored cement are discussed: when syngenite is formed from gypsum, water is liberated which may cause prehydration of the cement phases.
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Research context
OpenAlex topics: Concrete and Cement Materials Research · Calcium Carbonate Crystallization and Inhibition · Magnesium Oxide Properties and Applications
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Affiliations
University of Aberdeen; Dowell-Schlumberger
References
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